import std.conv, std.functional, std.range, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, std.numeric, std.regex, std.typecons;
import core.bitop;

class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; }
int readInt() { return readToken.to!int; }
long readLong() { return readToken.to!long; }
real readReal() { return readToken.to!real; }

bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } }
bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } }

int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; }
int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); }
int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); }




void main() {
  try {
    for (; ; ) {
      const N = readInt();
      auto A = new real[N];
      foreach (i; 0 .. N) {
        A[i] = readReal();
      }
      
      real cdd = 0.0, cdb = 0.0, cbb = 0.0, cd = 0.0, cb = 0.0;
      foreach (i; 0 .. N) {
        // ((d i + b) - A[i])^2
        cdd += i^^2;
        cdb += 2.0 * i;
        cbb += 1.0;
        cd -= 2.0 * i * A[i];
        cb -= 2.0 * A[i];
      }
      /*
        [ 2 cdd    cdb ] [ d ]   [ -cd ]
        [   cdb  2 cbb ] [ b ] = [ -cb ]
      */
      cdb /= 2.0;
      cd /= 2.0;
      cb /= 2.0;
      const denom = cdd * cbb - cdb^^2;
      const d = ((-cd) * cbb - cdb * (-cb)) / denom;
      const b = (cdd * (-cb) - (-cd) * cdb) / denom;
      
      real ans = 0.0;
      foreach (i; 0 .. N) {
        ans += ((d * i + b) - A[i])^^2;
      }
      writefln("%.10f %.10f", b, d);
      writefln("%.10f", ans);
    }
  } catch (EOFException e) {
  }
}